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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A055687 Numbers k such that 4^k == -1 (mod k-1).

Table of values

n a(n)
1 2
2 18
3 4098
4 7362
5 85074
6 658530
7 3999138
8 72281282
9 285143058
10 628944690
11 854112114
12 1423081170
13 2561019282
14 3111576930
15 4298117634
16 5921265042
17 14224884930
18 21336998130
19 34317377234
20 50723421714
21 63797137890
22 144269032050
23 163834314354
24 187397322210
25 212565453282
26 231286579794
27 232992827298
28 266198715090
29 314834584482
30 348160787730
31 580045717650
32 706501722498

List of values

[2, 18, 4098, 7362, 85074, 658530, 3999138, 72281282, 285143058, 628944690, 854112114, 1423081170, 2561019282, 3111576930, 4298117634, 5921265042, 14224884930, 21336998130, 34317377234, 50723421714, 63797137890, 144269032050, 163834314354, 187397322210, 212565453282, 231286579794, 232992827298, 266198715090, 314834584482, 348160787730, 580045717650, 706501722498]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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